quid and mono
No confusion here. An MKR cannot, as one of you claims, indicate DH. Only an altimeter, radio or pressure, can do that. It is not correct to infer from receiving an MKR signal that the aircraft is at a particular height.
An MKR does not give an azimuth signal per se, as does an NDB, but it does indicate position in the azimuth plane by virtue of the fact that if an aircraft receives it, the aircraft is approximately overhead it. Technically it's a position line rather than a position because it's a fan marker but when this position line is combined with the runway extended centreline (LOC) it gives an azimuth position.
At that position the aircraft's actual height from the altimeter, radio or pressure, is compared with the nominal MKR crossing height on the approach plate for, among other things, a gross error check for correct GP lobe and correct altimeter subscale setting. Same if altitude is used.